[teacpde]

This one is amazing, even just the fact that someone thought about representing images with binary format of prime number

[userbinator]

I suspect it was partly inspired by https://en.wikipedia.org/wiki/Illegal_number#Illegal_primes

[dmurray]

The first version of this I saw came from the webcomic in this reddit thread about a prime number that looks like a giraffe.

After one commenter showed off this technique, someone else found a minimal prime giraffe: 7.

[0] https://www.reddit.com/r/math/comments/7qpfls/does_there_exi...